Machinery alarm



H. AMRHEIN MACHINERY ALARM Filed June 22, 1925 Patented Oct. 20, 1925.

PATENT OFFICE.

HENRY AMRHEIN, OF OXNARD, CALIFORNIA.

MACHINERY ALARM.

Application led June 22, 1925.

To all whom it may concern.'

Be it known that I, HENRY AMRHEIN, a citizen of the United States, and a resident of Oxnard, in the county of Ventura and State of California, have invented a new and useful Machinery Alarm, of which the following is a specification.

The present invention relates to improvements in alarms for use in connection with machinery.

The general object of the invention is the provision of anv alarm adapted for use 1n connection with the clearance space of a reciprocating motor, pump, compressor or the like to indicate a reduction in the size of said space, as when the piston moves beyond its normal distance of travel.

The above and other objects are accomplished by instrumentalities pointed out in the following specification.

The invention is clearly defined in the claims.

A satisfactory embodiment of the invention is illustrated in the accompanying drawings forming part of the specification and in Whichz Figure l is a vertical, longitudinal section of the complete invention in use.

Figure 2 is a detail bottom plan view of the invention in use, showing a fragment of a cylinder head.

Figure 3 is a fragmentary detail vertical section of a modification of the invention.

The clearance space a between the piston 5 and the head 6 of the cylinder may be that found in an ordinary gas or steam motor, pump, compressor or the like. The opening 7 in head 6 receives the reduced inner end portion of a casing 8, and the parts are rigidly connected as by screw threads. An internally disposed valve seat 9 provides a support for a valve disk 10, which adjustably supports a plunger 11 extending through an opening in the valve and connected thereto as by screw threads 12. The inner end of plunger 11 extends into clearance a, and adjacent to a point defining the limit of normal movement of piston 5 in one direction.

As a result of this adjustment of the plunger it can only contact with the piston when the same moves beyond its normal limit, as when the bearings or mountings of Serial No. 38,866.

any of the parts connected thereto become worn or fractured. A lock-nut 13, screwed upon plunger 11, prevents creeping of the plunger' in a direction toward piston The interior of the inner end portion of the casing is made a snug lit for the plunger and has two oppositely disposed open ended ports 14-15 through which communication is affected between clearance a and a chamber 16 within the casing 8, which communicates with the atmosphere through constricted outlets 17. Passage through the ports 14- 15 is controlled by valve 10 which, when lifted by piston 5, causes a hissing sound or audible signal to be made by permitting the escape of compressed fluid from cylinder (5 into the atmosphere through constricted openings 17. l

A straight row of ratchet teeth 18 on one side of plunger 11, co-operate with a pawl 19 to render the audible signal continuous by automatically locking the plunger against inward movement. The pawl is non-cylindrical in cross section and is slidable in a correspondingly shaped laterally disposed .guide opening in casing 8. This construction prevents accidental turning of the pawl from engagement with the ratchet. A compression spring 20 urges the pawl 1) into contact with the ratchet, and yields to allow the ratchet to override the pawl in the outward movement of the plunger.

A housing 21, secured as by bolts 22, to casing 8, surrounds the outer end portion ot the pawl and confines the spring 20. A, cap 23 is detachably connected to the outer end of the housing to provide a guide for an operating handle 24.

The handle 24 is slidable in an opening in the cap and is iixedly secured to the pawl and is manually operable to disengage the pawl from the ratchet when it is desirable to release .the plunger to return to its normal position within the clearance a.

A plate 25, slidable within casing 8 and held against tilting, as by a socket 26 upon the outer end of plunger 11, provides a bearing for one end of a compression spring 27, which operates to hold valve 10 seated against the pressure of fluid within clearance a, acting through the ports lh- 15. A slidable plate 28, disposed upon the outer end of spring 27, is moved by an adjusting screw 29 extending through a screw threaded opening in bonnet 30 to tension or compress-spring@ fte e requiradgxtent, The onnet 30 is det ly eomctiditoercasing 8, as by screw threads 31, and a lock nut 32 upon screw 29 prevents accidental turning thereof.

In the modified form shown iii-Figure .3, a plate 33, corresponding to plate25, may be employed, during its outward `movement under the action of plunger 34, to operate a neck arm .35 shaving .one end extemling finto casing 36 through :a lateral :opening 37 A bracket S8, bolted as1a1;.39,1to thezcasing 36, is adapted as at Odoprovide a :fulcrum for rock, aum 36, which rries at its .outer .end vacontact 'block Adthatis adapted to abut :a-contaet .block A2 on bracket l38 when erm de moved byplateil. Bhe'blncks fil-42 operate to close an electric circuit in which is yconnected an ordinary electric bell, (not shown), which eperates :by sounding, togve the required s' Although I have shown and described one `embodiment of lmy invention, it is Vto be understood that the name is susceptible to various changes; and I reserve the right to employ such as vmay come withinthe scope of the appended claims.

'to the cylinder, a .plunger suppe I claimzf 1. An alarm for indicating reduction in the clearance .of a cylinder `having a racitiv roeating p'tnnand cemprng Sound producing means, a plunger extending into the clearance of the cylinder and operable byA the 'piston for setting the sound producingqv means in operation.

`2. An alarm for indicating reduction in `n thencleu'ance-of a` cylinder having a recip-"l" ducing means mel casing and extending into Atlieolearmmeof the cylinder fand operable bycthe piston 'ist settingztlle `sound producing means in opel'f ation.

HENRY AMBHEIN. 

